Journal
Advanced Energy Materials
Volume 5, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201401943
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Funding
- Ministry of Science and Technology of China (973 projects) [2012CB932903, 2012CB932904]
- Beijing Science and Technology Committee [Z131100006013003]
- National Natural Science Foundation of China [51372270, 51372272, 21173260, 11474333, 91433205, 51421002, 91233202]
- Knowledge Innovation Program of Chinese Academy of Sciences
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Novel large pi-conjugated carbon material, graphdiyne (GD), as a dopant to poly(3-hexylthiophene) (P3HT) hole-transporting material (HTM) layer, is introduced into perovskite solar cells for the first time. Raman spectroscopy and ultraviolet photoelectron spectroscopy measurements reveal that relatively strong pi-pi stacking interaction occurs between GD particles and P3HT (so-called P3HT/GD composite HTM), favorable for the hole transportation and improvement of the cell performance. On the other hand, some GD aggregates exhibit a scattering nature, and thus help to increase the light absorption of the perovskite solar cells in the long wavelength range. As high as 14.58% light-to-electricity conversion efficiency is achieved, superior to the pristine P3HT-based devices. Additionally, the devices exhibit good stability and reproducibility. Time-resolved photoluminescence decay measurements reveal that the P3HT/GD HTM can accelerate the hole extraction compared with pristine P3HT.
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